...H R DAVIES The Jubilee Line Extension took the London Underground network for the first time into the difficult waterlogged sands and gravels in the south east of the capital. However, there were very few problems with the now tried-and-tested technology of earth pressure balance tunnelling...

... GEOTECHNICS TUNNELS RAILWAYS TBM BORING MACHINES MACHINERY PLANT EQUIPMENT TUNNELLING UNDERSEA CUTTERS HEADS PUMPS AIR COMPRESSED EARTH PRESSURE BALANCE EPBM BOULDERS MARL EXCAVATING EXCAVATIONS TILL GLACIAL CONCRETE HEAT FIRES RESISTANCE STOREBAELT DENMARK...

... in 1995, the 1·8 km long, 8·4 m dia. tunnel has been built to accommodate double-stack container trains and replaces an existing century-old tunnel link. The concretelined tunnel was driven by one of the largest ever full-face earth pressure balance machines through soft squeezing clay with shallow cover...

... balance machine (EPBM). Although it may have been possible to use a slurry machine, this was rejected for a number of reasons. As shown on Fig. 8 an EPBM covers a much wider range of soil conditions. The presence of very large boulders would have made the use of a slurry machine difficult due to the need...

... TootingBee Common, which included the useof ground freezing techniques and the introductioonf a purpose-built earth pressure balance tunnel boring machine,are givenin ref. 3. 18. Stage 2A, the section from Battersea to Barrow Hill, was awardedin March 1988. The original design prohibited any tunnel driving...

... DEWATERING THANET SAND SAND THANET STABILISATION EPBM EARTH PRESSURE BALANCE MACHINES SLURRY SELECTION SPECIFICATIONS LININGS PRECAST SEGMENTS SEGMENTAL CONTRACTS FIFTH EDITION SITES SHAFTS CITIES SUPPLY WATER SUPPLY AMEC THAMES WATER UTILITIES © Thomas Telford and ICE...